diff --git a/backend/internal/repository/claude_oauth_service.go b/backend/internal/repository/claude_oauth_service.go
index b03b5415..35e7f535 100644
--- a/backend/internal/repository/claude_oauth_service.go
+++ b/backend/internal/repository/claude_oauth_service.go
@@ -233,11 +233,17 @@ func (s *claudeOAuthService) RefreshToken(ctx context.Context, refreshToken, pro
 }
 
 func createReqClient(proxyURL string) *req.Client {
-	return getSharedReqClient(reqClientOptions{
-		ProxyURL:    proxyURL,
-		Timeout:     60 * time.Second,
-		Impersonate: true,
-	})
+	// 禁用 CookieJar，确保每次授权都是干净的会话
+	client := req.C().
+		SetTimeout(60 * time.Second).
+		ImpersonateChrome().
+		SetCookieJar(nil) // 禁用 CookieJar
+
+	if strings.TrimSpace(proxyURL) != "" {
+		client.SetProxyURL(strings.TrimSpace(proxyURL))
+	}
+
+	return client
 }
 
 func prefix(s string, n int) string {
diff --git a/backend/internal/service/account_usage_service.go b/backend/internal/service/account_usage_service.go
index c4220c0c..439e9508 100644
--- a/backend/internal/service/account_usage_service.go
+++ b/backend/internal/service/account_usage_service.go
@@ -76,7 +76,7 @@ type antigravityUsageCache struct {
 }
 
 const (
-	apiCacheTTL         = 10 * time.Minute
+	apiCacheTTL         = 3 * time.Minute
 	windowStatsCacheTTL = 1 * time.Minute
 )